Question

‘A’ is 100% more efficient than ‘C’, while ‘B’ is 200% more efficient than ‘A’. Together, they complete a task in 15 days. After ‘A’ and ‘C’ work for 9 days, they stop. How long will ‘B’ take to finish the remaining work?

A 6 days
B 9 days
C 12 days
D 15 days
E 18 days
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